Skip to main content
SpringerLink
Log in

Relative Yield and Period of Individual Groups of Delayed Neutrons in 233U, 235U, and 239Pu Fission by Epithermal Neutrons

  • Published:
Atomic Energy Aims and scope

Abstract

The relative yield of delayed neutrons and the half-life of their precursor nuclei in fissioning of 233U, 235U, and 239Pu by epithermal neutrons are measured on a setup which is based on a KG-2.5 electrostatic accelerator. The experimental samples are irradiated in a polyethylene cube, one face of which is irradiated by a neutron beam consisting of T(p, n)3He neutrons. A procedure is developed for averaging the group parameters of delayed neutrons from different series of measurements, taking account of their correlation. A comparative analysis of the data of this work and in ENDF/BVI in terms of the average half-life of the precursor nuclei of the delayed neutrons and using the dependence of the reactivity on the asymptotic period of the reactor is performed.

It is shown that the data of this work agree, to within the uncertainty limits, with the recommended experimental data and differ substantially from the ENDF/BVI data.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

REFERENCES

  1. R. Tuttle, “Delayed neutron yield in neutron fission,” Report INDC(NDS)-107/G,” in: Proceedings of the Consultants Meeting on Delayed Neutron Properties, IAEA, Vienna, Austria (1979), pp. 29–67.

    Google Scholar 

  2. J. Blachot, M. Brady, A. Filip, et al., “Status of delayed neutron data - 1990,” Report NEACRP-L-323, NEANDC-29 “U”, OECD, NEA/NSC (1990), pp. 1–26.

  3. E. Fort, V. Zammit-Averlant, M. Slavatores, and A. Filip, “Recommended values of the delayed neutron yield for: U-235, U-238, and Pu-239,” Status Report of the WPEC Subgroup 6 Activities A. D'Angelo (ed.), OECD, NEA/NSC (2000), pp. 1–50.

  4. V. Manevich, “Delayed neutron database,” Report INDC(CCP)-298/G, IAEA, Vienna, Austria (1989), pp. 1–10.

    Google Scholar 

  5. M. Brady and T. England, “Delayed neutron data and group parameters for 43 fissioning systems,” Nucl. Sci. Eng., 103, 129–135 (1989).

    Google Scholar 

  6. J. Blachot, “Delayed neutron yield for 39 fissile systems,” in: Proceedings of an International Conference on Nuclear Data for Science and Technology, May 13- 17, 1999, Julich, Federal Republic of Germany, pp. 89–91.

  7. G. Spriggs, “In-pile measurements of the decay constants and relative abundances of delayed neutrons,” Nucl. Sci. Eng., 114, 342–351 (1993).

    Google Scholar 

  8. G. Keepin, T. Wimett, and R. Zeigler, “Delayed neutrons from fissionable isotopes of uranium, plutonium, and thorium,” J. Nucl. Energy, 6, 1–21 (1957).

    Google Scholar 

  9. ENDF-102, Data Formats and Procedures for the Evaluated Nuclear Data File ENDF-6 (1991).

  10. V. Piksaikin and S. Isaev, “Correlation properties of delayed neutrons from fast neutron-induced fission,” Report INDC(CCP)-415, October 1998, IAEA, Vienna, Austria, pp. 1–13.

    Google Scholar 

  11. S. Isaev, V. Piksaikin, L. Kazakov, et al., “Systematics of the delayed neutron characteristics and validation of the delayed neutron database obtained in the microscopic approach,” in: Proceedings of the 8th International Seminar on the Interaction of Neutrons with Nuclei, May 17- 20, 2000, JINR, Dubna, Russia, pp. 306–321.

    Google Scholar 

  12. V. M. Piksaikin, Yu. F. Balakshev, S. G. Isaev, et al., “Measurement of the energy dependence of the parameters of delayed neutrons in fissioning of 237Np by fast neutrons,” At. Énerg., 85, No. 1, 51–59 (1998).

    Google Scholar 

  13. V. Piksaikin, V. Shorin, and R. Tertytchnyi, “Fission rate determination in delayed neutron emission measurements with T(p, n) and D(d, n) neutrons,” Report INDC(CCP)-422, August 1999, IAEA, Vienna, Austria, pp. 1–11.

    Google Scholar 

  14. V. M. Piksaikin, Yu. F. Balakshev, S. G. Isaev, et al., “Measurement of the relative yields of delayed neutrons and half-lives of their precursors in fissioning of 237Np by fast neutrons,” Vopr. At. Nauk. Tekh. Ser. Yad. Konst., No. 1- 2, 18–25 (1997).

  15. J. Stevenson, “Delayed neutron parameter requirements for reactor physics purposes,” in: Proceedings of the Specialists' Meeting on Delayed Neutron Properties, September 15- 19, 1986, University of Birmingham, England, pp. 1–20.

  16. G. Spriggs, J. Campbell, V. Piskaikin, et al., “An 8-group delayed neutron model based on a consistent system of half-lives,” Report LA-UR-98-1619, LANL, March 28, 1999, pp. 1–19.

Download references

Author information

Authors and Affiliations

  1. State Science Center of the Russian Federation – A. I. Leipunskii Physics and Power-Engineering Institute, Russia

    V. M. Piksaikin, L. E. Kazakov, G. G. Korolev, S. G. Isaev, V. A. Roshchenko & M. Z. Tarasko

Authors
  1. V. M. Piksaikin
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. L. E. Kazakov
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. G. G. Korolev
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. S. G. Isaev
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. V. A. Roshchenko
    View author publications

    You can also search for this author in PubMed Google Scholar

  6. M. Z. Tarasko
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Piksaikin, V.M., Kazakov, L.E., Korolev, G.G. et al. Relative Yield and Period of Individual Groups of Delayed Neutrons in 233U, 235U, and 239Pu Fission by Epithermal Neutrons. Atomic Energy 92, 147–155 (2002). https://doi.org/10.1023/A:1015878706836

Download citation

  • Issue Date:

  • DOI: https://doi.org/10.1023/A:1015878706836

Keywords

Search

Navigation